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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHfNG AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW1O 06/11/03 725 19 15 -1190 000 560 05 12 39 663 h 142 MW10 06/11/03 725 <0 5* MW 10 09/17/03 725 2064 -1339 000 4 10 <0 5 <0 5 22 594 h 110 MW10 09/17/03 725 <0 5* MWIO 12/08/03 725 2054 -1329 000 175 17 07 3 1 1,030 h 97 MW10 12/08/03 725 <0 5* MW 10 03/02/04 725 19 19 -1194 000 148 1 1 07 2 1 794 h 163 MW10 03/02/04 725 <0 5* MW10 06/28/04 725 2033 -1308 000 880 22 05 41 1,040 h 98 MW10 06/28/04 725 <0 5* MWIO 09/27/04 725 2136 -1411 000 MW 10 09/28/04 725 -- -- -- 118 17 07 62 1,190 h 119 MW10 09/28/04 725 <0 5* MW10 12/01/04 725 2092 -1367 000 190 28 22 86 1,320 It 148 MW10 12/01/04 725 <0 5* MW 10 03/24/05 725 1895 -1170 000 -- -- -- -- -- MW10 03/25/05 725 -- -- -- 203 20 10 48 1,270 h 64 MW I O 03/25/05 725 <0 5* MW 10 06/22/05 725 1861 -1136 000 114 14 1 2 4 1 1,040 h 115 MW 10 06/22/05 725 <1* MW 10 10/12/05 725 2042 -13 17 000 -- -- -- -- -- __ MW 10 10/13/05 725 -- -- -- 10 <5 0 <5 0 <5 0 1,100 h <25 MW10 12/22/05 725 2016 -1291 000 19 <2.5 <2 5 36 1,200 h 12/<O 5* MW 11 05/02/91 10 15 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- MW 11 07/16-17191 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 10/15/91 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 04/30/92 10 15 3772 -2757 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW11 08/13/92 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 10/08/92 1015 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW i l 02/23/93 1015 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- MWII 05/18/93 1015 glprojects1739421masterlwplgl205Q942gw xis Page 25 of 59